480
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120
The result of the equation - 30 plus 90 plus 60 plus 80, is found as follows; 30 + 90 + 60 + 80 = ( 30 + 90 ) + 60 + 80 = 120 + ( 60 + 80 ) = 120 + 140 = 260 Answer = 260
-90
LCM for 90 and 120 is 360.
(120 + 60) ÷ 2 = 90